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<div class="title">src/ca/uqac/dim/turtledb/Relation.java</div>  </div>
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<a href="_relation_8java.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-------------------------------------------------------------------------</span>
<a name="l00002"></a>00002 <span class="comment">    Simple distributed database engine</span>
<a name="l00003"></a>00003 <span class="comment">    Copyright (C) 2012  Sylvain Hallé</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This program is free software: you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">    the Free Software Foundation, either version 3 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">    (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This program is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00013"></a>00013 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00017"></a>00017 <span class="comment"> -------------------------------------------------------------------------*/</span>
<a name="l00018"></a>00018 <span class="keyword">package </span>ca.uqac.dim.turtledb;
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="keyword">import</span> java.util.*;
<a name="l00021"></a>00021 
<a name="l00028"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html">00028</a> <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html">Relation</a>
<a name="l00029"></a>00029 {
<a name="l00030"></a>00030   
<a name="l00035"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a068bf821f5d7d4b51c19c9093a5564d5">00035</a>   <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a068bf821f5d7d4b51c19c9093a5564d5">m_streamingMode</a> = <span class="keyword">false</span>; 
<a name="l00036"></a>00036   
<a name="l00041"></a>00041   <span class="keyword">public</span> <span class="keyword">abstract</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a7a7af53642133603e51e04d79f938286">getSchema</a>();
<a name="l00042"></a>00042   
<a name="l00047"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#adec0e5510db4801ec9e230d1d3e938b9">00047</a>   <span class="keyword">protected</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#adec0e5510db4801ec9e230d1d3e938b9">Relation</a>()
<a name="l00048"></a>00048   {
<a name="l00049"></a>00049     super();
<a name="l00050"></a>00050   }
<a name="l00051"></a>00051 
<a name="l00056"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a5547b88c42ce6e50c463d9a0e3ef42d0">00056</a>   <span class="keyword">public</span> <span class="keyword">final</span> <span class="keywordtype">int</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a5547b88c42ce6e50c463d9a0e3ef42d0">getDegree</a>()
<a name="l00057"></a>00057   {
<a name="l00058"></a>00058     <span class="keywordflow">return</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a7a7af53642133603e51e04d79f938286">getSchema</a>().size();
<a name="l00059"></a>00059   }
<a name="l00060"></a>00060   
<a name="l00065"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ab6ffd428cfef16a5476b990751f0570b">00065</a>   <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ab6ffd428cfef16a5476b990751f0570b">setStreamingMode</a>(<span class="keywordtype">boolean</span> b)
<a name="l00066"></a>00066   {
<a name="l00067"></a>00067     <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a068bf821f5d7d4b51c19c9093a5564d5">m_streamingMode</a> = b;
<a name="l00068"></a>00068   }
<a name="l00069"></a>00069   
<a name="l00070"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#acd5caf578d0fd8af02e230004dd6a1e7">00070</a>   <span class="keyword">public</span> <span class="keyword">final</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#acd5caf578d0fd8af02e230004dd6a1e7">iterator</a>()
<a name="l00071"></a>00071   {
<a name="l00072"></a>00072     <span class="keywordflow">if</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a068bf821f5d7d4b51c19c9093a5564d5">m_streamingMode</a>)
<a name="l00073"></a>00073       <span class="keywordflow">return</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ae5ed6d099a1c47cc0aa0026f9b5a4431">streamIterator</a>();
<a name="l00074"></a>00074     <span class="keywordflow">return</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a2ea66dc69ae6dc86627aed815ebd40b6">cacheIterator</a>();
<a name="l00075"></a>00075   }
<a name="l00076"></a>00076   
<a name="l00080"></a>00080   @Override
<a name="l00081"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ae622e86850cef5b988e17bc199129ebe">00081</a>   <span class="keyword">public</span> String <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ae622e86850cef5b988e17bc199129ebe">toString</a>()
<a name="l00082"></a>00082   {
<a name="l00083"></a>00083     StringBuilder out = <span class="keyword">new</span> StringBuilder();
<a name="l00084"></a>00084     <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> sch = this.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a7a7af53642133603e51e04d79f938286">getSchema</a>();
<a name="l00085"></a>00085     <span class="keywordflow">for</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_attribute.html">Attribute</a> s : sch)
<a name="l00086"></a>00086     {
<a name="l00087"></a>00087       out.append(s).append(<span class="stringliteral">&quot;\t&quot;</span>);
<a name="l00088"></a>00088     }
<a name="l00089"></a>00089     out.append(<span class="stringliteral">&quot;\n&quot;</span>);
<a name="l00090"></a>00090     <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; sch.size(); i++)
<a name="l00091"></a>00091     {
<a name="l00092"></a>00092       out.append(<span class="stringliteral">&quot;--------&quot;</span>);
<a name="l00093"></a>00093     }
<a name="l00094"></a>00094     out.append(<span class="stringliteral">&quot;\n&quot;</span>);
<a name="l00095"></a>00095     Iterator&lt;Tuple&gt; i = this.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#acd5caf578d0fd8af02e230004dd6a1e7">iterator</a>();
<a name="l00096"></a>00096     <span class="keywordflow">while</span> (i.hasNext())
<a name="l00097"></a>00097     {
<a name="l00098"></a>00098       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = i.next();
<a name="l00099"></a>00099       <span class="comment">//for (Attribute s : t.keySet())</span>
<a name="l00100"></a>00100       <span class="keywordflow">for</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_attribute.html">Attribute</a> s : sch)
<a name="l00101"></a>00101       {
<a name="l00102"></a>00102         <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_value.html">Value</a> v = t.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#a8d2822b5abbaf7d7e8f9e0ccd5a035db">get</a>(s);
<a name="l00103"></a>00103         out.append(v).append(<span class="stringliteral">&quot;\t&quot;</span>);
<a name="l00104"></a>00104       }
<a name="l00105"></a>00105       out.append(<span class="stringliteral">&quot;\n&quot;</span>);
<a name="l00106"></a>00106     }
<a name="l00107"></a>00107     <span class="keywordflow">return</span> out.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_value.html#a1f78a614b10f89e7164e0660198fd04b">toString</a>();
<a name="l00108"></a>00108   }
<a name="l00109"></a>00109   
<a name="l00110"></a>00110   <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#adb708409ab8c4a428ed102c4ce850ffe">accept</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor.html">QueryVisitor</a> v) <span class="keywordflow">throws</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor.html">QueryVisitor</a>.VisitorException;
<a name="l00111"></a>00111   
<a name="l00119"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ad9a0a0c06639d3697952669e4c504420">00119</a>   <span class="keyword">public</span> <span class="keywordtype">int</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ad9a0a0c06639d3697952669e4c504420">getCardinality</a>()
<a name="l00120"></a>00120   {
<a name="l00121"></a>00121     <span class="keywordtype">int</span> size = 0;
<a name="l00122"></a>00122     Iterator&lt;Tuple&gt; i = this.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#acd5caf578d0fd8af02e230004dd6a1e7">iterator</a>();
<a name="l00123"></a>00123     <span class="keywordflow">while</span> (i.hasNext())
<a name="l00124"></a>00124     {
<a name="l00125"></a>00125       i.next();
<a name="l00126"></a>00126       size++;
<a name="l00127"></a>00127     }
<a name="l00128"></a>00128     <span class="keywordflow">return</span> size;
<a name="l00129"></a>00129   }
<a name="l00130"></a>00130   
<a name="l00138"></a>00138   <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keywordtype">int</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#aa39696dd8f39129e2c02e1323c01b124">tupleCount</a>();  
<a name="l00147"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a19071d0ee56a8c3e2c5374a355cfec4d">00147</a>   <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a19071d0ee56a8c3e2c5374a355cfec4d">contains</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> tup)
<a name="l00148"></a>00148   {
<a name="l00149"></a>00149     <span class="keywordflow">if</span> (tup == null)
<a name="l00150"></a>00150       <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00151"></a>00151     assert tup != null;
<a name="l00152"></a>00152     Iterator&lt;Tuple&gt; i = this.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#acd5caf578d0fd8af02e230004dd6a1e7">iterator</a>();
<a name="l00153"></a>00153     <span class="keywordflow">while</span> (i.hasNext())
<a name="l00154"></a>00154     {
<a name="l00155"></a>00155       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = i.next();
<a name="l00156"></a>00156       <span class="keywordflow">if</span> (tup.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#ad5be2811554ef22301c274978350715b">equals</a>(t))
<a name="l00157"></a>00157         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00158"></a>00158     }
<a name="l00159"></a>00159     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00160"></a>00160   }
<a name="l00161"></a>00161 
<a name="l00166"></a>00166   <span class="keyword">public</span> <span class="keyword">abstract</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#ae5ed6d099a1c47cc0aa0026f9b5a4431">streamIterator</a>();
<a name="l00167"></a>00167   
<a name="l00172"></a>00172   <span class="keyword">public</span> <span class="keyword">abstract</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a2ea66dc69ae6dc86627aed815ebd40b6">cacheIterator</a>();
<a name="l00173"></a>00173   
<a name="l00179"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a78d7c63efc57aac8604051a03443551c">00179</a>   <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a78d7c63efc57aac8604051a03443551c">isFragment</a>()
<a name="l00180"></a>00180   {
<a name="l00181"></a>00181     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00182"></a>00182   }
<a name="l00183"></a>00183   
<a name="l00190"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#abeb9200b77b041da59550c75aab6fe22">00190</a>   <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#abeb9200b77b041da59550c75aab6fe22">isLeaf</a>()
<a name="l00191"></a>00191   {
<a name="l00192"></a>00192     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00193"></a>00193   }
<a name="l00194"></a>00194 }
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